Two-part expansion-shield.



H. B. NEWHALL, JR. & H. W. PLEISTER.

TWO PART EXPANSION SHIELD.

APPLICATION FILED MAR. 12, 1912.

1 0 2 993 Patented May 27, 1913 Hen/7y Z1). P1611922 ATTORNEYS UHEDsrn'r ns PALIENT OFFICE.

HENRY B. NEi'WHALL, JR., 0F PL AINEIELD, AND-HENRY W. PLEiSTER, 0FWESTFIELD, NEW JERSEY, ASSIGNORS TO HENRY B. NEWHALL, OF ILAINFIELD, NEWJ EBSEY.

TWO-PART EXPANSION-SHIELD.

Specification of Letters Patent.

Patented m 27, 1913.

Application filed March 12, 1912. Serial No. 683,257.

To all whom it may concern:

Be'it known that we, HENRY B. N iwHALL, J11, and HENRY W. PLEISTER,citizens or the U1 (1 States, residing, respectively, at Fla-infield, inthe county of Union, and Westtield, in the county of Union, State of NewJersey, have invented-certain new and useful Improvements in-Two-PartExpansion-Shields, of which the following is a specification.

Our presentinvention has to do with expansion shields, the use ofwliichis at present both frequent and welhknown, and our object is to enablethe productionot expansion shields, formed of sheet metal, which will behighly cfiicient in use and which may be stamped out and pressed toshape in a simple and inexpensive manner.

Our invention consists broadly in a shield formed in two parts which areexpansible in diametrically opposite directions by the action of a boltworking t-herebetweenand in this manner is distinguished from ourcopending application No. (583,256, filed of even date herewith, andwhich aims to construct the two bolt parts from a single piece ofmaterial. Each of these parts comprises for ready an outer-sectionadapted to grip the wall of an opening, and an inner section which is soformed as to constitute an advancing screw to codperate with the threadsof a bolt. The sections are also provided with coiiperating mcanswhichspace and support them in proper relation, and with means which ho dthem together in such relation, uosition within an opening in which theyare to be expanded.

From a more specific standpoint, our present invention contemplates theprovision of a two-part bolt shield of which the parts are in separatepieces which may be temporarily held-by any suitable means.

Our invention further contemplates the provision of an inner section foreachshield part which may have a continuous thread from end to end, orthethr oad of which may be interrupted and in spaced sericsthroughout,or even a single thread series at each end, each form having itsparticular advantages.

In the accompanying drawing, Figure 1 is a longitudinal section throughboth parts of shield commonly known as a two-part shield. Fig. 2 is aside elevation thereof; Fig. 8 is a transverse section taken on line 3 3of Fig. 1. Fig. t is asimilar view taken on line et t of Fig.1. Fig. 5is a plan View of the blank before concaving. Fig. 0 is a view similarto Fig. 1, through a shield having an interrupted thread, and Fig. 7 isanother similar view showing an other form of interrupted thread.

It is apparentthatone-part and twopart shields each include two parts,so that in referring to one or the other of the shield parts, we desireto be understood as speaking of the parts irrespective of the fact'thatin one form they are independent, while in the other form they areconnected.

Referring now particularly ,to the figures of the drawing, the shieldcomprises independent shield parts A and B, each of which in turn,consists of an inner section C. and an outer section D. "The parts A andB are similarly stamped from sheet metal in the form shown in Fig.5,-the sections C and I) being in cnd-to-end relation in the same plane,and connected by webs Eof the same material. i

The section C is widened adjacent one end in order to provide projectingside edges C, which need only extend for a portion of its length, and isat. the same time formed with a series of transverse corrugations Cextending throughout its length, the ends of which corrugationsterminateshort of the side edges C.

The section D is of a width substantially equal to the greatest width ofsection C, and is provided with spaced depressions D and U, of which theformer is substantially deeper than the latter. both of thesedepressions being rectangular in shape and so disposed that thcirdirection or greatest length is at right angles to the longitudinalaxis'of the sc'ction. Thus it will be apparent that when the sections Cand. D are folded upon one another in the manner shown in Fig. 1,

' tween them.

As will be seen plainly in Figs. 2, 3 and 4, the sections C and D areconcaved in such a manner that the curvature of the outer section D isin a greater degree than that of.

the inner section C, and the side edges C of the latter are curvedinversely with respect to the curvature of its body, so as to extendaround portions of the side edgesof the section D and thus, with thecooperation of the webs E, firmly unite the sections of each of theshield parts.

As before stated, the thread or the transverse corrugations C may becontinuous through the length of the inner sections, as shown in Fig. 1,or it may be interrupted as shown in Figs. 6 and 7, in the former ofwhich the corrugations are shown in spaced series C and in the latter ofwhich the corrugations'are shown in single series C arranged at theopposite ends of the inner section.

From the foregoing, it is clear that our construction is fully capableof meeting all requirements, and of performing all the functions of thecast metal shields'now in connnon use, and is susceptible of variedforms, of which we wish to be .understood as reserving all such as fallwithin the terms of the claims.

Having thus fully described our invention,

what we claim is:

1. An expansion shield formed of sheet metal and comprising a pair oftransversely curved parts, each part including an outer section and aninner section, said sections having means whereby to maintain theirproper relation in each part. i

2. An expansion shield comprising two parts, each part-including anouter t ansversely curvcd section, and an inner transversely curvedsection, the latter having extending side edges inversely curved aboutthe side edges of the outer section.

3. An expansion shield comprising two parts, each of which partsincludes an outer transversely curved section and an inner transverselycurved section inclined with respect to said outer section, saidsections of each part being formed of a single piece of material andprovided with means whereby to maintain their proper relation.

4. An expansion shield .lormed of sheet metal and comprising twotransversely curved parts, each of said parts including an outer sectionand an inner section. bent one upon the other, and having relativelyengaging mcans whereby to maintain their proper relation, the innersections having transverse corrugations cooperating to form a boltadvancing screw.

5. An expansion shield comprising two parts, each part including anouter transversely curved section and an inner transversely curvedsection, the former having extended portions projecting in a greaterdegree adjacent one end than the other, and adapted to contact with theinner section and maintain the same in an inclined position with respectto the outer section.

(S. An expansion shield formed of sheet metal and comprising twotransversely curved parts, each of said parts including an outersectionand an inner section, bent one upon the other, and havingrelatively engaging means whereby to maintain their proper relation,.the inner sections having transverse corrugations.arranged in spacedseries and adapted to cooperate to form-a bolt advancing screw.

7. An expansion shield comprising two parts, each of which partsincludes an outer transversely curved section and an inner transverselycurved section inclined with respect to said outer section, saidsections being formed of a single piece of sheet metal and bent one uponthe other. i

8. An expansion shield comprising two parts, each of which partsincludes an outer transversely curved section, said sectionsbeing formedof a single piece of sheet metal,

and said inner section having transverse corrugations and extended sideedges inversely curved about the side edges of the outer sec-,

tion. 9. An expansion shield comprising two parts, each of which partsincludes an outer transversely curved section and an inner transverselycurved section inclined with respect to said outer section, said shieldparts being formed separate from, and independdcnt of, one another, andthe said sections of each part being formed in one piece.

10. An expansion shield formed of sheet metal and comprising apair oftransversely curved parts, each of said parts including an outer sectionand an inner section, said inner sections being adapted to coiiperate toform a bolt advancing screw.

11. An expansion shield formed of sheet metal and comprising a generallycylindrical member consisting of semi-cylindrical parts which areseparate from one another and each of which includes an inner sectionand an outer section, said inner sections being adapted to cooperate toform a bolt advancing screw when the parts of the member are together.

ln testimony whereof we aflix our signa turcs in presence of twowitnesses.

HENRY B. NEVHALL, J R. HENRY W. PLEISTER. Witnesses:

C. M. LYONS, A. M. WILLIAMS.

